（Photo Credit: Step by Step Productions） The 40th Regensburg Early Music Festival concluded with a gesture as grand as its milestone year. A performance of Alessandro Striggio’s “Missa sopra Ecco sì beato giorno”—a 40-part polyphonic mass—transcended the bounds of concert and became a revived rite. Long queues stretched down the street outside St. Blasius Church, as festivalgoers—some wheeling suitcases—gathered as {…}